HydraMaster Boxxer 421 Coupling Rubber Plug Briggs & Stratton Parts Nearly every leak at a

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HydraMaster Boxxer 421 Coupling Rubber Plug Briggs & Stratton Parts Nearly every leak at aOverview Rubber drive coupling plug for the coupler between the engine and the blower. HydraMaster part number 000 106 045, listed as Plug, HD4 Coupling 1" O. D. 7 8" Lg., 70 durometer EPDM. A coupler takes eight plugs. They are a wear item, and they are the part that stands between the engine and the blower. Specifications Outside diameter: 1 inch Length: 7 8 inch Material: EPDM, 70 durometer Coupling type: HD4 Quantity per coupler: 8 What it fits